Stop fighting with CORS errors. Start fixing them.
CORSFIX is a premium diagnostic tool designed to help developers identify, understand, and resolve Cross-Origin Resource Sharing (CORS) issues in seconds. Whether you're working with Express, Next.js, FastAPI, or Rust, CORSFIX provides the exact code snippets you need to get your API talking to your frontend.
Paste your console error directly into the analyzer. CORSFIX uses a heuristic engine to detect:
- Framework Detection: Automatically identifies if you're using Next.js, Laravel, Django, Express, Go (Fiber/Gin), or Rust (Actix).
- Root Cause Isolation: Distinguishes between missing headers, preflight failures, and credential mismatches.
- Ready-to-Use Snippets: Provides copy-pasteable configuration code tailored to your specific backend stack.
Live-test your endpoints from our server. See exactly what headers your API is actually returning in a real-world request scenario.
- Inspect
Access-Control-Allow-Originand other critical headers. - Validate preflight (OPTIONS) request handling.
Bypass CORS restrictions during local development without touching a single line of backend code. CORSFIX provides a managed proxy command to tunnel your requests securely.
Keep track of the errors you've encountered and save the working solutions to your personal dashboard for future reference.
- Paste: Copy the red text from your browser's console.
- Analyze: CORSFIX breaks down the error type and calculates a confidence score.
- Fix: Follow the step-by-step instructions and use the generated code snippet to update your server configuration.
- Verify: Use the Health Monitor to probe your API and confirm the headers are now correctly set.
- Frontend: Next.js 15 (App Router), Tailwind CSS, Framer Motion
- Authentication: Clerk
- Payments: Polar.sh
- Backend Logic: Serverless Functions (Next.js API Routes)
- Styling: Premium "Glassmorphism" UI with Lucide Icons
We believe in security. CORSFIX only logs the structure of the error and the framework detected to improve our analysis engine. We never store sensitive API keys or private data sent through the probe service.
Found a framework we missed? Feel free to open a PR! We're constantly expanding our parser.ts to support more backend ecosystems.
Built for developers who value their time. Try CORSFIX Live